add a bit of timing
allow specification of an object size of a fraction of a megabyte
time should be taken after joining all processes
generate pseudorandom data on the fly

cleanup the former commit

remove unused import
don't use a float, specify object size in KB by appending to the size argument instead
Merge pull request #1 from bcwaldon/jasdeep-perf

Generate (probably) incompressible data, add timing info